gmt (version 1.0-0)

geodist: Distance Between Geographic Coordinates

Description

Calculate surface distance between geographic coordinates.

Usage

geodist(Nfrom, Efrom, Nto, Eto, units="km")

Arguments

Nfrom

latitude of origin

Efrom

longitude of origin

Nto

latitude of destination

Eto

longitude of destination

units

how distance is measured: "km" for kilometres, "nm" for nautical miles

Value

• Vector of distances.

Details

Latitude and longitude are passed as decimal numbers, e.g. 66.5 for 66$^{\circ}$30$'$N. Vectors of coordinates are supported.

See Also

diff calculates the difference between two numbers. Trigonometric functions are summarized on the Trig help page.

Examples

geodist(55.75,37.62, 39.9,116.4)  # Moscow - Beijing
geodist(90,0, -90,0, "nm")        # from pole to pole